What does the AUTO setting on car lights mean?

[DiMartin]

AUTO stands for automatic. The AUTO setting on car lights means the lights (low beam and daytime running lights) are automatically controlled to turn on or off based on environmental conditions. When the car lights are set to this position, they will not illuminate during the day but will automatically turn on at night. Here is some information about the AUTO setting on car lights: 1. Working principle: Sensors such as photoresistors (installed behind the rearview mirror, etc.) send electronic signals to the ECU (Electronic Control Unit, similar to a computer's CPU), informing the ECU whether to turn the headlights on or off or switch between high and low beams. The ECU then controls the headlights' operation. 2. In tunnels, on cloudy days, or in any dimly lit areas, the car lights will automatically turn on. When exiting a tunnel or when lighting conditions improve, the lights will automatically turn off.